Electrospun Nanofibers with Embedded Yolk-Shell Particles for Catalytic Applications

用于催化应用的嵌入蛋黄壳颗粒的电纺纳米纤维

• 批准号: 323249705
• 负责人: Privatdozentin Dr. Petra Uhlmann, Ph.D., since 9/2022
• 金额: --
• 依托单位: Leibniz-Institut für Polymerforschung Dresden (IPF)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/323249705?language=en
• 关键词: Electrospun; Nanofibers; Embedded; Yolk; Shell

The integration of catalytically active nanoparticles in macroscopic supports is crucial for their application in heterogenous catalysis. We want to investigate the embedding of so-called yolk-shell particles into porous electrospun fibers and the catalytic properties of these novel structures. Yolk-shell particles are core-shell systems, consisting of a reactant-permeable shell and a single catalytically active core. Preliminary results demonstrate that catalytic activity of yolk-shell particles may be substantially improved by using block copolymers as sacrificial template and efficient porogen and additional embedding them in a porous matrix to prevent aggregation and fusion We plan to investigate the reasons for the enhanced catalytic activity. In particular, we will study the role of increased accessibility of catalytically active sites for the reactants through the porous shell and the increased stability of particles against aggregation and fusion. By combining block copolymer template approach for the fabrication of yolk-shells with electrospinning technique for the fabrication of nanofibers, we will be able to fabricate fiber mats with embedded catalytically active yolk-shell particles. These macroscopic carrier systems are suitable for flow-type catalytic processes. They will be investigated using model reactions (catalytic dye degradation) and further applied in water cleaning. The main goals of the present project are: (a) Preparation and investigation of yolk-shell type nanocatalyst having catalytically active core and reactant permeable shell using block copolymer template approach and mechanistic understanding of enhanced catalytic activity.(b) Embedment of yolk-shell type nanocatalyst into electrospun nanofibers and fabrication of catalytically active fibrous mat.(c) Investigation of catalytic activity of fibrous mat and its testing for water purification processes (e.g. for catalytic degradation of dyes as water pollutants).The project will be carried out in frame of international research collaboration between Leibniz Institute of Polymer Research, Dresden, and Indian Institute of Technology Delhi. The competences of the partners are ideally complementary with strengths of the Indian Partner in the field of block copolymer self-assembly and electrospinning, and strengths of the German Partner in the field of nanoparticle/nanocatalyst synthesis and preparation of the nanoparticle/block copolymer nanocomposites as well as characterization of mechanics and interactions of fibers. Obtained results will lead to new concepts for preparation of flow-type catalytic systems for water purification processes and environmental purposes.

催化活性纳米粒子在宏观载体中的整合对于它们在多相催化中的应用至关重要。我们想要研究将所谓的蛋黄壳颗粒嵌入多孔电纺纤维中以及这些新颖结构的催化性能。蛋黄-壳颗粒是核-壳系统，由反应物可渗透的壳和单个催化活性核组成。初步结果表明，通过使用嵌段共聚物作为牺牲模板和高效致孔剂，并将其额外嵌入多孔基质中以防止聚集和融合，可以显着提高蛋黄壳颗粒的催化活性。我们计划研究催化活性增强的原因。特别是，我们将研究通过多孔壳增加反应物催化活性位点的可及性以及增加颗粒抗聚集和融合的稳定性的作用。通过将用于制造蛋黄壳的嵌段共聚物模板方法与用于制造纳米纤维的静电纺丝技术相结合，我们将能够制造嵌入催化活性蛋黄壳颗粒的纤维垫。这些宏观载体系统适用于流动型催化过程。将使用模型反应（催化染料降解）对它们进行研究，并进一步应用于水清洁。本项目的主要目标是：（a）使用嵌段共聚物模板方法制备和研究具有催化活性核和反应物可渗透壳的蛋黄壳型纳米催化剂以及增强催化活性的机理理解。（b）将蛋黄壳型纳米催化剂嵌入电纺纳米纤维并制造催化活性纤维垫。（c）研究 纤维垫及其水净化过程测试（例如作为水污染物的染料的催化降解）。该项目将在德累斯顿莱布尼茨聚合物研究所和德里印度理工学院之间的国际研究合作框架下进行。合作伙伴的能力与印度合作伙伴在嵌段共聚物自组装和静电纺丝领域的优势以及德国合作伙伴在纳米颗粒/纳米催化剂合成和纳米颗粒/嵌段共聚物纳米复合材料的制备以及纤维力学和相互作用表征领域的优势完美互补。所获得的结果将带来用于水净化过程和环境目的的流式催化系统的制备的新概念。